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  • 1
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    Entry science experiments for Viking 1975. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A review is given of our present knowledge of the Martian atmosphere with special emphasis on the results obtained by the Mariner 4, 6 and 7 fly-bys. The Viking Project offers the first opportunity for in situ measurements which should resolve many questions left open by previous work. A description is given of the neutral gas mass spectrometer and retarding potential analyzer experiments to be performed as the lander enters the upper atmosphere and the experiments planned for determining atmospheric structure as the lander approaches the surface of the planet.
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; Feb. 197
    Format: text
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  • 2
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    Modification of the Martian ionosphere by the solar wind (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Dynamic model for Martian ionosphere modification by solar wind, assuming negligible Mars magnetic moment and neutral atmosphere
    Keywords: SPACE SCIENCES
    Type: ; ACE(
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  • 3
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    Mercury's atmosphere from Mariner 10 - Preliminary results (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Analysis of data obtained by the ultraviolet experiment on Mariner 10 indicates that Mercury is surrounded by a thin atmosphere consisting in part of helium. The partial pressure of helium at the terminator is about 5 trillionths of a millibar. The total surface pressure of the atmosphere is less than about 2 billionths of a millibar. Upper limits are set for the abundance of various gases, including hydrogen, oxygen, carbon, argon, neon, and xenon. The wavelength dependence of Mercury's surface albedo is similar to that of the moon over a broad range of wavelengths from 500 to 1600 A. Strong signals were recorded by the airglow instrument as Mariner 10 passed through the cavity behind Mercury. They are as yet unexplained but may provide information on the properties of the local plasma.
    Keywords: SPACE SCIENCES
    Type: Science; 185; July 12
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  • 4
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    Ultraviolet observations of Venus from Mariner 10 - Preliminary results (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An objective grating spectrometer on Mariner 10 has measured airglow in the wavelength range 200 to 1700 angstroms. The data reveal the presence of significant concentrations of hydrogen, helium, carbon, and oxygen atoms in the upper atmosphere of Venus. A preliminary analysis of the hydrogen data indicates an exospheric temperature of 400 K. There is evidence for intense airglow emission at wavelengths longward of 1350 angstroms; the nature of this emission is unclear, but the radiation is spatially extensive and detectable on both day and night sides of the planet.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Mar. 29
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  • 5
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    The Atmospheres of Venus and Mars. (1968)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Collection of papers on atmospheres of Venus and Mars covering atmospheric models, light scattering, radio occultation experiments, etc
    Keywords: SPACE SCIENCES
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  • 6
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    Jupiter's ionosphere - Prospects for Pioneer 10 (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Model Jovian ionospheres are constructed for comparison with Pioneer 10 results. Electron density maxima are predicted at a level approximately 220 kilometers above an assumed reference height where the hydrogen density is 10 to the 16-th power molecules per cubic centimeter. It may be possible to use observations of the electron density to locate the turbopause. Attention is drawn to a possible strong source of ionized sodium from Io which might lead to large electron densities at low altitudes.
    Keywords: SPACE SCIENCES
    Type: Science; 184; Apr. 12
    Format: text
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  • 7
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    Stability of the Martian atmosphere (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A detailed chemical dynamic model is presented for a moist Martian atmosphere. Recombination of CO2 is catalyzed by trace amount of H2O. The abundances of CO and O2 should vary in response to changes in atmospheric H2O and atmospheric mixing.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-130799 , SRCC-177
    Format: application/pdf
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  • 8
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    Engineering models of the Venus atmosphere. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Engineering models of the Venus atmosphere are presented for use in spacecraft design and mission planning. The models are developed from (1) data measured by the U.S. Mariner 5 and USSR Venera spacecraft, (2) earth-based measurements, and (3) theory which best satisfies the observations. The models include a most probable model and models for extremes of molecular mass and solar activity. In addition to the basic engineering models, other atmospheric characteristics and parameters affecting the models are discussed including planetary radius, atmospheric composition and clouds.
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 73-130 , Aerospace Sciences Meeting; Jan 10, 1973 - Jan 12, 1973; Washington, DC
    Format: text
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